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Guest Editorial: The next act for nonwovens, TAPPI JOURNAL A

Guest Editorial: The next act for nonwovens, TAPPI JOURNAL August 2017

Journal articles
Magazine articles
Open Access
Visual discrimination of hygiene tissue softness in the abse

Visual discrimination of hygiene tissue softness in the absence of haptic feedback, TAPPI JOURNAL August 2017

Journal articles
Magazine articles
Open Access
Modeling the influence of forming fabric structure on vacuum

Modeling the influence of forming fabric structure on vacuum box dewatering, TAPPI JOURNAL August 2017

Journal articles
Magazine articles
TAPPI News, Tissue360º Spring/Summer 2013

TAPPI News, Tissue360º Spring/Summer 2013

Journal articles
Magazine articles
SetPoint: A recycled Fiber Shortage?, Tissue360º Spring/Summ

SetPoint: A recycled Fiber Shortage?, Tissue360º Spring/Summer 2014

Journal articles
Magazine articles
Success in New Hampshire: Gorham P&T Optimizes New Tissue Ma

Success in New Hampshire: Gorham P&T Optimizes New Tissue Machine Production to Premium Quality, Tissue360º Spring/Summer 2014

Journal articles
Magazine articles
Improve the Effectiveness of Your Steam Showers, Tissue360º

Improve the Effectiveness of Your Steam Showers, Tissue360º Spring/Summer 2014

Journal articles
Magazine articles
Open Access
Editorial: In praise of challenging papers

Editorial: In praise of challenging papers, and those who review them, TAPPI JOURNAL August 2015

Journal articles
Magazine articles
Open Access
Numerical analysis of the impact of rotor and screen hole plate design on the performance of a vertical pulper, TAPPI Journal April 2025

ABSTRACT: The dissolving of mechanical pulp is one of the most important process steps in stock preparation, since pulping occurs at the very beginning of the papermaking process. Efficient mixing of the pulp in a short amount of time is essential to achieve high furnish volume flow rates. The design of the rotor, as well as the pulper vat and inserts, significantly affects the overall performance of the pulper, such as mixing efficiency and power demand. Using advanced numerical methods such as computational fluid dynamics (CFD) can accelerate the development process. The CFD simulations allow for detailed analysis of flow phenomena, making it possible to study a real-size machine numerically. This approach is particularly advantageous because it can reduce the need for timeconsuming and costly experiments associated with scaling up test rigs. In this study, we compared two different rotor designs utilized in a vertical pulper and evaluated the numerical results with experimental data. Rotor A is designed for low turbulence and low power demand, while rotor B is designed for high turbulence with high power demand. The CFD results showed good agreement with the experimental measurements. We investigated how the rotor design influences the free fluid surface and the mixing efficiency. Our study also highlights the differences in results depending on whether water or furnish is simulated, which exhibit Newtonian or, respectively, non-Newtonian fluid behavior. Additionally, a detailed numerical investigation of various screen hole plate designs revealed that the newly developed hole design significantly reduces pressure loss compared to a standard drilled hole. This outcome was consistent for both types of fluids investigated: water and furnish.

Journal articles
Magazine articles
Open Access
Editorial: PFAS—Intersections with the pulp and paper industry, TAPPI Journal March 2021

ABSTRACT: At the 2019 PEERS Conference in St. Louis, I sat in on a talk concerning the use of fluoropolyomers for welding and reparing of Flexible pipe.

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